Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Asexual reproduction of poplar (Populus deltoides G-3) and harvesting of biomass for pulp production.

Abstract

Field experiments were conducted to determine suitable dates for collecting cuttings for vegetative propagation, and suitable age for harvesting Populus deltoides 'G-3' for pulping, at the Regional Research Laboratory, Jorhat, Assam. Cuttings were collected monthly in 1994 and 1995, and planted directly in nursery beds. Higher percentages of sprouting (>90%) and survival (>70%) were recorded from cuttings collected during December, January and February. Harvesting was undertaken at ages from 1 to 7 yr, from plots established in 1995 using saplings of uniform size planted at 1.5Ă—1.5 m spacing. Four-year-old plants gave the optimum yields of biomass and pulp. This is attributed to the abrupt increase in number of branches, photosynthetic area (leaf area), and higher nitrogen uptake and carbohydrate content up to this age.